Wrench



Patented May 2', 1933 UhllTD STATES ARCHIBALD R. LMEUX, 0E WORCESTER, MASSACHUSETTS WRENCH Application led March 21, 1932. Serial N0. 600,086.

rlhis invention relates to a wrench of the type in which one jaw is moved toward and from the other by a double screw, the screw being operated by a sliding nut on the coarser .screw-thread. Tt is applicable to other forms of wrenches but is shown in the form of a monkey-wrench.

The principal object of this invention is to provide the nut engaging the hner screwthread in its most simple form; to associate that nut with the sliding jaw by merely providing a perforation through this jaw and forming theebody of the nut located in that perforation; to provide an improved mounting for the end bearing of the screw, and to provide a wrench of this character of a very neat and attractive appearance and also strong, durable and economical.

Other objects and advantages of the invention will appear hereinafter.

Reference is to be had to the accompanying drawing, in which F ig. 1 is a side View of a wrench made in accordance with this invention;

Fig. 2 is an edge view of the saine;

Fig. 3 is a sectional view on the line 3-3 of Fig. 1 showing the operating nut, and

Fig. 4 is a sectional view on the line 4-4 of Fig. 1 showing the .sliding jaw and the way the nut is connected with it.

Tn a general way, this wrench is made similar to other wrenches now on the market. It comprises a main frame having a fixed jaw 11 projecting therefrom. This frame is in the form of a pair of guides having a longitudinal slot between them and in the present case it is closed at one end by a bearing member 12 which is pinned to the frame by a pin 13 and is provided with convex surfaces projecting out of the plane of the frame and lrnurled. This nut is set into the ends of the frame and projects over the ends. In this bearing member 12 is ournaled one end of a double screw rod 14. This screw, as usual in this class of wrenches, has a coarse screw-thread at one end and a finer screwthread at the other, the coarse thread of course being much longer than the fine thread. It has its other bearing at 15 in the ,stationary frame, in fact in the butt end of the jaw 11. The sides of the frame 10 and the jaw 11 are in two planes not very far apart and uniform from en-d to end.

0n the coarse screw-thread is mounted a nut 16. This nut is shown in cylindrical form and with a knurled surface being of the same size and shape as the bearing piece 12 and it has a screw-thread meshing with the coarse screw-thread. A pair of grooves 18 are out in the opposite sides of this nut for receiving the frame 10, which frame, as stated, constitutes two guides for this nut. This nut is easily slidable along these guides. Tt will be obvious, therefore, that the sliding of this iLiut along the guides, which prevent the nut irom turnnig, will result in the rotation of the screw. Y

Also engaging the fine screw-thread is another nut 20. This nut is shown as of rectangular shape, although that is not necessary, 70

and it passes through and ts in two rectangular perforations or openings in the opposite sides of a slide 21 which has upon it the movable jaw 22 of this wrench. This slide 1s slidably mounted on the frame and guides heretofore mentioned and is moved into its desired position by the sliding of the nut 16 as described. On account of the quick pitch of the small thread and the slow pitch of the other thread, this jaw 22 cannot be moved back by any pressure on the jaw itself but has to be moved by the operation of the nut 16.

Tt will be seen that the nut is of the simplest form. It is first made of the proper shape and threaded and then put into place through the perforation 23 in the jaw slide, then the screw is introduced into it. These parts are introduced from the end, and the screw placed in position with its end 15 in its bearing and then the bearing 12 is placed in position and pinned. After this is accomplished, there is no way in which the nut 20 can be removed without taking the wrench all to pieces and also as it fits snugly in the opening 28, there is no way in which it can be loosened. This constitutes a very simple and convenient wrench to use and the manufacture of it is reduced practically to the simplest terms.

Although I have illustrated and described only one form of the invention, I am vaware of the fact that modiiications can be made therein by any person skilled in the art without departing fromv the scope of the invention as expressed in the claim. Therefore, I do not wish to be limited to all the details of construction herein shown and described, but what I do claim is Y As an article of manufacture, a monkeywrench comprising a frame having a xed jaw and two members projecting from the butt of the jaw at right angles to the operating surface of said jaw and spaced apart, thev inner surfaces of said members constituting opposite guides, a double-threaded screw in the space between the two members, the threads of said screw being coarse at one end and finer at the other, a movable jaw carried and guided by said frame and having an opening through it, a nut in said opening fitting the liner of said screw-threads, a nut slidable along the frame and fitting the coarse screw-thread for operating the sliding jaw, and a bearing member located at the extreme end of the frame for receiving one end of the screw, said bearing member and sliding nut being similarly recessed on opposite sides for receiving and fitting around the edges of said members and the bearing member being pinned to the ends of said members, said bearing member and slidable nut being cylindrical and of substantially the same size and shape.

In testimony whereof I have hereunto affixed my signature.

ARCHIBALD R. LEMIEUX. 

